KYIV, Ukraine — Ukrainian forces hit an important fuel pipeline in the Moscow region that supplies the Russian army, Ukraine's military intelligence said Saturday, as Russia kept up a sustained campaign of massive drone and missile attacks on Ukraine’s energy infrastructure .

The operation was carried out late Friday, according to a statement on the Telegram messaging channel. The agency, which is known by its acronym HUR, described it as a “serious blow” to Russia’s military logistics.

HUR said its forces struck the Koltsevoy pipeline, which spans 400 kilometers (250 miles) and supplies the Russian army with gasoline, diesel and jet fuel from refineries in Ryazan, Nizhny Novgorod and Moscow.

The operation, which targeted infrastructure near Ramensky district, destroyed all three fu

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